R. David Murray <rdmur...@bitdance.com> added the comment:

Given your problem report wouldn't the simplest solution be to change the close 
method to be:

   if hasattr(self, '_file'):
       if hasattr(self._file, 'close'):
           self._file.close()
       del self._file

As for a test, it seems to me that adding a test to the appropriate existing 
cases that calls get_file and then closes the returned object twice should be 
sufficient.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue11700>
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